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LenKa [72]
3 years ago
11

A bag contains 120 marbles. The theoretical probability of randomly drawing a purple marble is 4/5 find the number of purple m

arbles in the bag HELPPPP!!
Mathematics
1 answer:
andrew11 [14]3 years ago
7 0

Answer:

4/5 is the same as 8/10, or 80%

so, multiply the 120x .8= 100

100 purple marbles

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the length of a rectangle is 7 yd less than three times the width, and the area of the rectangle is 66 yd(squared). find the dim
Alex_Xolod [135]
So legnt=l
width=w
l=-7+3w
l=3w-7

area=66
area=legnth times width or
area=lw

subisutte
area=lw
l=3w-7
66=(3w-7)(w)
66=3w^2-7w
subtrac 66 from both sides
0=3w^2-7w-66
factor
HOW TO
multiply 3 and -66=-198
find what 2 numbers add up to -7 and multiply to get -198
the numbers area 11 and -18
so
3w^2-18w+11w-66=0
factor
(3w^2-18w)+(11w-66)=0
(3w)(w-6)+(11)(w-6)=0
factor using distributive (ab+ac=a(b+c))

(3w+11)(w-6)=0
set them to zero
3w+11=0
subtract 11
3w=-11
legnths cannot be negative so we discard this

w-6=0
add 6
w=6

width=6
legnth=3w-7
length=3(6)-7
legnt=18-7
legnth=11


width=6
legnth=11

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Step-by-step explanation:

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Answer:

\frac{14}{33}

Step-by-step explanation:

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Solve x^2 + 4x + 8 = 0
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Answer:

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Step-by-step explanation:

Solve for x:

x^2 + 4 x + 8 = 0

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x^2 + 4 x = -8

Add 4 to both sides:

x^2 + 4 x + 4 = -4

Write the left hand side as a square:

(x + 2)^2 = -4

Take the square root of both sides:

x + 2 = 2 i or x + 2 = -2 i

Subtract 2 from both sides:

x = -2 + 2 i or x + 2 = -2 i

Subtract 2 from both sides:

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